Search for pair production of the scalar top quark in muon+tau final states

• Published in: Physics letters. B Vol. 710; no. 4-5; pp. 578 - 586
• Main Authors: Abazov, V.M., Alexeev, G.D., Alkhazov, G., Aoki, M., Åsman, B., BackusMayes, J., Baldin, B., Banerjee, S., Bezzubov, V.A., Bhatia, S., Brandt, O., Bross, A., Brown, D., Burdin, S., Buszello, C.P., Camacho-Pérez, E., Chakraborty, D., Chen, G., Cho, D.K., Choi, S., Claes, D., Cousinou, M.-C., Demina, R., Deterre, C., Ding, P.F., Dorland, T., Dubey, A., Duperrin, A., Ferbel, T., Gershtein, Y., Golovanov, G., Grivaz, J.-F., Grünewald, M.W., Haas, A., Hebbeker, T., Hegab, H., Heinson, A.P., Heintz, U., Herner, K., Hohlfeld, M., Iashvili, I., Jaffré, M., Jesik, R., Jonckheere, A., Joshi, J., Lebrun, P., Lee, H.S., Lokajicek, M., Lyon, A.L., Maciel, A.K.A., Malik, S., Martínez-Ortega, J., McCarthy, R., Melnitchouk, A., Merkin, M., Mulhearn, M., Narain, M., Nayyar, R., Neal, H.A., Neustroev, P., Novaes, S.F., Otero y Garzón, G.J., Parashar, N., Petrillo, G., Podesta-Lerma, P.L.M., Prokopenko, N., Quinn, B., Safronov, G., Sajot, G., Salcido, P., Sánchez-Hernández, A., Sawyer, L., Scanlon, T., Scheglov, Y., Schellman, H., Shary, V., Shchukin, A.A., Simak, V., Sirotenko, V., Slattery, P., Sonnenschein, L., Stark, J., Stolin, V., Strauss, M., Strom, D., Tokmenin, V.V., Tuchming, B., Uzunyan, S., Varelas, N., Verzocchi, M., Vesterinen, M., Vilanova, D., Vokac, P., Welty-Rieger, L., Wicke, D., Yamada, R., Yang, W.-C., Yatsunenko, Y.A., Zielinski, M., Zivkovic, L.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 20.04.2012; Elsevier
• Subjects: B QUARKS; DECAY; Exact sciences and technology; Experiment-HEP; FERMILAB TEVATRON; High Energy Physics - Experiment; LUMINOSITY; MUONS; NEUTRINOS; Nuclear physics; PAIR PRODUCTION; PARTICLE ACCELERATORS; Physics; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; PRODUCTION; SCALARS; STANDARD MODEL; T QUARKS; The physics of elementary particles and fields; Exclusions; Leptons; Luminosity; Quarks; Top particles; Center of mass; Neutrinos; Elementary particles; Standard model; Pair production; Massless particles; Scalar particle; Muons
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/j.physletb.2012.03.028

We present a search for the pair production of scalar top quarks (t˜1), the lightest supersymmetric partners of the top quarks, in pp¯ collisions at a center-of-mass energy of 1.96 TeV, using data corresponding to an integrated luminosity of 7.3 fb−1 collected with the D0 experiment at the Fermilab Tevatron Collider. Each scalar top quark is assumed to decay into a b quark, a charged lepton, and a scalar neutrino (ν˜). We investigate final states arising from t˜1t˜¯1→bb¯μτν˜ν˜ and t˜1t˜¯1→bb¯ττν˜ν˜. With no significant excess of events observed above the background expected from the standard model, we set exclusion limits on this production process in the (mt˜1,mν˜) plane.